Trigonometric functions all blur together,
Sine, cosine, tangent, secant--a jumble of radial operations.
Integrate this function times that one.
Make sure the interval is right.
Wait, too soon.
Substitute in a u.
Make it the natural log's derivative first.
Plug all the numbers back,
And finally an answer!
Just remember to add a C.
That's just f(x).